Revert of Sandbox html_viewer on Linux.

components/font_service/public/cpp/font_loader.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef COMPONENTS_FONT_SERVICE_PUBLIC_CPP_FONT_LOADER_H_
-#define COMPONENTS_FONT_SERVICE_PUBLIC_CPP_FONT_LOADER_H_
-
-#include "base/containers/hash_tables.h"
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
-#include "components/font_service/public/cpp/mapped_font_file.h"
-#include "components/font_service/public/interfaces/font_service.mojom.h"
-#include "third_party/skia/include/core/SkStream.h"
-#include "third_party/skia/include/core/SkTypeface.h"
-#include "third_party/skia/include/ports/SkFontConfigInterface.h"
-
-namespace mojo {
-class ApplicationImpl;
-}
-
-namespace font_service {
-namespace internal {
-class FontServiceThread;
-}
-
-// FontConfig implementation for Skia which proxies to the font service to get
-// out of the sandbox. This methods of this class (as imposed by blink
-// requirements) may be called on any thread. (Because of this restriction,
-// also see the FontServiceThread class.)
-//
-// This is the mojo equivalent to content/common/font_config_ipc_linux.h
-class FontLoader : public SkFontConfigInterface,
-                   public internal::MappedFontFile::Observer {
- public:
-  explicit FontLoader(mojo::ApplicationImpl* application_impl);
-  ~FontLoader() override;
-
-  // SkFontConfigInterface:
-  bool matchFamilyName(const char family_name[],
-                       SkTypeface::Style requested,
-                       FontIdentity* out_font_identifier,
-                       SkString* out_family_name,
-                       SkTypeface::Style* out_style) override;
-  SkStreamAsset* openStream(const FontIdentity& identity) override;
-
- private:
-  // internal::MappedFontFile::Observer:
-  void OnMappedFontFileDestroyed(internal::MappedFontFile* f) override;
-
-  // Thread to own the mojo message pipe. Because FontLoader can be called on
-  // multiple threads, we create a dedicated thread to send and receive mojo
-  // message calls.
-  scoped_refptr<internal::FontServiceThread> thread_;
-
-  // Lock preventing multiple threads from opening font file and accessing
-  // |mapped_font_files_| map at the same time.
-  base::Lock lock_;
-
-  // Maps font identity ID to the memory-mapped file with font data.
-  base::hash_map<uint32_t, internal::MappedFontFile*> mapped_font_files_;
-
-  DISALLOW_COPY_AND_ASSIGN(FontLoader);
-};
-
-}  // namespace font_service
-
-#endif  // COMPONENTS_FONT_SERVICE_PUBLIC_CPP_FONT_LOADER_H_